| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 3889357 |
89.7%
|
| 2 | 2. Some difficulty | 59178 |
1.4%
|
| 3 | 3. A lot of difficulty | 17050 |
0.4%
|
| 4 | 4. Cannot do at all | 25002 |
0.6%
|
| 5 | 5. Do not know | 8940 |
0.2%
|
| 6 | 6. Cannot yet be determined | 177185 |
4.1%
|
| 9 | 9. Unspecified | 160985 |
3.7%
|
| Sysmiss | 80897 |